The Window of Tolerance is a concept from Dr Dan Siegel. It describes the zone where your nervous system can feel, think, and connect without being overwhelmed. Inside the window, life feels workable — even when it's hard. Outside it, we tip into hyperarousal (too much) or hypoarousal (too little).
The window of tolerance is the range of arousal in which you can feel, think and connect at the same time. Inside it, emotion is workable. Above it you are in fight or flight; below it you are in shutdown. The term comes from Dan Siegel and is widely used in trauma-informed work.
Above the window looks like racing thoughts, a pounding heart, irritability, panic or an urge to run. Below it looks like numbness, heaviness, blankness, exhaustion or feeling far away from yourself. Neither is a failure of willpower — both are the nervous system doing what it learned to do.
Repeated overwhelming experiences teach the nervous system to react sooner and recover more slowly, so smaller things tip you out. Ongoing stress, poor sleep, illness, pain and isolation narrow it further. It is a learned response, which is also why it can widen again.
Small and often does more than long sessions: extended-exhale breathing, grounding, slow movement, sleep, and time with people whose presence settles you. Approaching difficult feelings in small doses and then returning to something steadying builds capacity without flooding.
They describe overlapping territory in different language. The window of tolerance describes a range of arousal; the polyvagal model describes three states — safe and social, mobilised, and shut down. Many people find the two useful together.
Educational only. If you feel unsafe, please reach out to Crisis Resources.
